To be released later this year, the doc is produced, co-written and narrated by the actor, is intended to sound the alarm about global warming as much as it is to offer solutions, sort of the next chapter after “An Inconvenient Truth.”

The question is whether DiCaprio’s star power will bring in any additional moviegoers than those who saw “Truth,” or if it will be merely preaching to the converted. The makers of “Truth” managed to also overcome what could be called “cause fatigue,” the idea that the problem is so dire that the public will simply avoid it.

The VF preview is essentially a transcript of statements made by climatologists, environmentalists and DiCaprio himself on what needs to be done and what can be done. Former CIA director James Woolsey notes the mobilization for World War II and that, “this country can move awfully fast, if it wants to.”

“Because we’ve waited, because we’ve turned our backs on nature’s warning signs, and because our political and corporate leaders have consistently ignored the overwhelming scientific evidence, the challenges we face are that much more difficult,” DiCaprio says.